Electrical dental and surgical appliance.



"No. 876,997; A v PATENTED JAN. 21, 1908.

2 SHEETSSHEET 1.

.H. F. PRESSEY. ELECTRICAL, DENT AND SURGI APPLIANCE.

- APPLIOA FILED APR. 24.

WITNESSES INVENTOR Harry hem? ,99'7. PATENTED JAN. 21, 1908.

H. F. PRESSEY. ELECTRICAL, DENTAL, AND SURGICAL APPLIANCE.

P TION FILED APR.Z4, 1907. AP LIOA 2 SHEBTSS HEET 2.

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UNITED STATES.

PATENT OFFICE.

HARRY I PRESSEY, OF BRIDGEPORT,, CONNECTICUT, ASSIGNOR OF ONE-THIRD TO WILLIS F. CHAMBERLAIN, OF BRIDGEPORT, CONNECTICUT.

ELECTRICAL DENTAL AND SURGICAL APPLIANCE.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application fi lApril 24.1907. SerialNo. 870.082.

To all whom it may concern: 7 p

Be it known that I, HARRY F. PRESSEY, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and' State of Connecticut, have invented certain new and useful Improvements in Electrical Dental and Surgical Appliances; and I do hereby declare the following to be a full, clear,

andexact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in electrical dental and surgical appliances, the main object being to provide a amp for the examination of the mouth, throat, teeth, and other portions of the human body, as well as wounds.

With these ends in view my invention consists in the combination of parts and arrange.- ment of parts. hereinafter fully described and then, particularly pointed out in the claims whichconclude this application. 7

.Heretofore various appliances of this sort have been contrived, but in using the same it usually becomes necessary that the operator shall. depress some resilient portion for the purpose of making a pro er electrical con nection, or, sometimes, t e lamp has been constructed in sections which are forced together to establish such connection. Constructions of this sort are used to a disadvanfage because sometimes the electrical conncction becomes accidentally broken, and

also, particularly in the performance of oper-.

atlons, it is quite inconvenient for the operator to keep a connection established by dcpressing a resilient element.

In my improvement the electric connections are permanent, and there is no break whatsoever of the electric circuit at any time. Moreover, my arrangement is such that there is no appreciable heat whatsoever to the lamp, the lamp-holder itself ma be made of a flexible material like block tm so that it may be bent for convenient use in certain instances, and the lamp itself may be removed 7 and theelectrical connections within the lamp holder withdrawn so that the holder may be readily sterilized.

1n the accompanying drawing which forms a part of this application Figure 1 is an elevation of my improvementFig. 2 a detail sectional elevation of the ohmic resistance coil -Fig. 3 a detail sectional elevation of the lam holder proper-Fi 4 a detail elevation s lowing the lamp ho der bent into a convenient shape for use in certain instances, and Fig. 5' a detail elevation of the lamp holder with the lam withdrawn from the end and the'electrical connections pulled out preparatory to the sterilization of the holder.

Similar numbers of reference denote like parts in the several figures of the drawing.

1 is an ordinary'electric light socket and 2 a suitable plu therein from which latter depend the insulated conductors 3, 4.

.5 is a metal casin which incloses an ohmic resistance coil 6 w 'ch is wound around a spool 7 of insulating material, one extremity 8 of this coil being in electrical contact with said casing, as shown at 9, while the other end 10 of said coil is in electrical contact with the conductor 4, as shown at 11.

able and ordinary lamp 12 and thence down into electrical contact with the casing 5 and the end of the coil 8.

13 is the lam holder pro er which is tubular and made 0 an suitab e conducting material but preferabfy from a flexible material like block tin. 14 is a hollow handle made of any suitable insulating material into Which the inner end .of the holder is forced. The outer extremity of the holder 13 is enlar ed as seen at 15 and within this enlarged portion is formed a threaded socket 16 beyond the inner end of which is formed a recess 17 within which latter is forced a plug 18 made of insulating material and surrounding a metal contact in 19 which projects at both which pin is secured the end of the conductor 3 while against the outer end impinges any suitable lamp 220 that is screwed within the socket 16 in the usual manner. v

The conductor 4, after its connection with the extremity 10 of the ohmicresistance coil extends beyond the casing 5 and has its extremity secured in electrical contact with the inner end of the holder 13, the outer extremity of this holder being electrically connected in the usual manner When the electric current is turned on it The conductor 3 first passes into any suitends beyond t 1e plug, to the inner end of with one end of the filament of the lamp 20,

- electrical contact with the outside of the easnot wish tobe limited in this respect.

I battery, which may be arranged in a portable bent in any direction, as, for instance, in the will light the lamp 12, completing the circuit therefor by passing down through. the coil 6 and back through the connection 11 directly to the plug 2, but there will be a residuum current which will pass downwardly through the conductor 3 beyond the ohmic resistance coil into the lamp 20, thereby lighting the same, and back through-the holder 13 and conductor 4 to-the plug 2. Thisresiduum current has only a fraction of an ampere and is suflicient merely to light the lamp 20 and therefore will give out no sensible heat whatsoever, so that there can be no burning or uncomfortable feeling whenever the lamp touches the flesh of the patient. Of course this residuum current will be determined by thewinding of the ohmic resistance coil, which winding is of course dependent upon the amount of voltage in the primary current as it passes through the lamp 12. V

' When not in use the holder 13 is hung between spring clips 21, that are securedin ing 5 and this will cause the lamp 20 to be extinguished since the current 'will short circuit.-'

In my improvement the holder is not seetional but is solid, and therefore it can bemanner shown at Fig. 4, andthis is a. great advantage since in many instances a straight holder cannot be used.

- By removing the lamp 20 the plug 18 may be readily withdrawn from the holder, as shown at Fig. 5, and the holder may then be' completely sterilized inside and outside.

From the foregoing it will be readily understood that the small lamp 20 will remain permanently lighted without any manipulation on the part of the operator, until the holder is hung on the clips, as above set forth. While I have described a preferred form of ohmic resistance coil, it will nevertheless be readily understood that any suitable resistance coil may be utilized so long as the ex-' tremities of the coil are connected as herein-' before described, or in other words, so long as any suitable resistance is employed which is in series with the large lamp and in multiple with the small lamp, and therefore I do Of course it will be readily understood that the use'of the large lamp is merely incidental in order that said lamp maybe available for the purposes of illumination in instances where electriclighting has been already installed, and I have illustrated such lam merely to show that my improvement nee not interfere with the use of-the same.

In instances where electricity has not already been installed I provide any suitable said pin,

"case, if desired, and make the connections;

precisely in the manner as hereinbel'ore de-.

scribed with the exception of course that the large lamp is not included in the circuit.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. Ina device of the character described, the combination of the hollow, integral, flexible, metallic holder, the insulatorplug seated within said holder near its outer end and surrounding a contact pin which projects at both ends beyond said plug, the'small lamp in the outer end of said holder and in contact with one end of said pin, the two insulated electrical conductors extending from a' source of electricity and having their free ends secured in electrical contact respectively with the-other end of said pin'and with the inner end of said holder, one of said conductors being connected comparatively near the source of. electricity with a lamp of high candle power, an ohmic resistance coil interposed in the circuit in series with the last mentioned lamp and in multiple with the first 'mentioned lamp, whereby the small lamp is lighted by a residuum current, a .metal casing surround ng said resistance coil and in electrical contact with oneend of the resistance coil and also with theinsulated conductor which is secured in contact with and the metallic spring clips secured to the outside of said-casing, whereby,

when the holder 15 hung between said chps and contact made therewith, the current will make a short circuit and will not pass through the small lamp; I

2. In a device of the character described,

the combination of the hollow, integral, flexible, metallic holder, the insulator plug seated within said holder near its outer end and surrounding a contact pin which projects at both ends beyond said plug, the small lamp in the of saidholder and-in contact wlth outer end one end of said pm, the two insulated electrical conductors extending from a source of electricity and having their free ends secured in electrical contact respectively with the other end of said pin and with the inner within said holder near its outer end and sur-' rounding a contact pin which projects at both ends beyond said plug, the small lamp in the outer end of said holder andiln contact with one end of said pin, the two insulated.

end of said holder, and a predetermined reelectrical conductors extending from a source of electricity and cured in electricalcontaet respectlvelywith having their free ends sethe other end of said pin and with the inner whereby contact between said holder and end of said holder, an ohmic resistance coil clips will cause said lamp to be extinguished. 10 having its extremities in connection with In testimony whereof I affiX my signature said conductors at a point intermediate of in presence of two witnesses.

said source and lamp' whereby a short cir- HARRY F. PRESSEY.

cuit is formed, and a casing surrounding said Witnesses:

coil and in electrical contact with oneend of F. W. SMITH, Jr.,

said coils and provided with contact clips l M. T. LONGDEN. 

